Kenga Prophet — M5.3 (Semantic Binding / Factory v2)

Same ~838K backbone as M4.2/M5/M5.2. Same training budget. Only the training distribution changed: identifier and call-structure shortcuts were removed from the verified corpus.

Result: semantic binding (calling the right function among same-signature distractors) went from broken to nearly solved — binding compile ×17.6 — with zero regression on the previous axes.

The controlled A/B/C result

Axis	Metric	M5.2	M5.3
A factory/template generalization	compile / run	92.5%	100%
	greedy match / pass@4	22.5 / 37.5%	27.5 / 37.5%
B semantic binding (distractors)	compile	5.6%	98.6%
	greedy match / pass@4	1.4 / 2.1%	6.2 / 16.0%
C real-code generation	compile	0/6	1/6 (17%)
	exact stdout match	0/6	0/6

Axis A test: unseen program templates, template-disjoint split.
Axis B test (bind): a target function plus 1–2 same-signature distractors; main must call the target — the name is the only discriminator.
Axis C: whole held-out human-written files; prompt = first fn block.

What this proves

The quality of a small model is determined not only by how much data it sees, but by which causal-semantic dependencies the data distribution forces it to learn.

M5.2 exposed the failure mode: trained on factory programs where main always called run(), the model emitted structurally perfect programs calling non-existent functions on real files (run(10) instead of fact(10)). Factory v2 randomizes function/local names across a pool, adds distractor functions, varies call patterns — and binding compiles at 98.6% without any architectural change.

The fact(14) story (why axis C match is 0)

M5.3's one successful real-file generation is more informative than its failures: prompted with the first block of a factorial seed file, it produced a fully working factorial program, correctly bound to fact, compiled and ran — printing 14! instead of the original's 5!. Exact-stdout matching on free continuation therefore conflates coding ability with reproducing the file author's arbitrary constant choices. realgen v2 (two-tier: body-completion with fixed args = fair match; free continuation = valid-program rate only) is the next eval revision.

Training

numpy transformer decoder: K=128, D=128, H=8, L=6 → ~838K params
128-token full-alphabet codec (a-z A-Z 0-9 _, BPE merges over real identifiers, digits spelled out)
per-position causal LM, Adam + global-norm clip 1.0, LR 0.002, batch 64, 2400 steps (~3 h CPU)
corpus v2: 14,550 verified programs in 5 families (arith / loop / rec incl. recursion↔iteration equivalents / chains / bind) + real Kenga files (90%/10% deterministic file-level split)
every training program executed by the real kenga-lite runtime

Repair signal (side experiment, rp0)

A repair model trained naively on 9,446 (broken → fixed) mutation pairs reached fixed@1 6.7% / pass@4 21.7% on template-disjoint mutants — after we fixed an evaluation bug where prompts containing a complete fn main strangled generation at token 5 (stop-condition checked the whole buffer). The naive setup lacks an explicit task boundary; a marker-token variant (<FIX>) is the planned rp1 control.

Honest notes

Earlier "~1%" real-code figures quoted for M4-era models were invalid due to an evaluation-script bug; do not cite them.
M4.2's "83%" real-code NT accuracy is train-set memorization, not held-out.
M5.3 predates the run-manifest patch (no _run.json); later releases include git commit + corpus sha256 + config snapshots.

Ladder position

M4.x   size ≠ solution
M5     verified synthetic data → template generalization (89.26%)
M5.2   +real code → transfer appears, binding shortcut exposed (5.6%)
M5.3   shortcut removed → binding solved (98.6%), A intact   ← this model
next   realgen-v2 tier-1, rp1 <FIX>, then Genesis v0 (gated)

Genesis entry gate status for this checkpoint: binding gate PASSED (98.6% ≥ 40%); real-gen gate pending tier-1 recount (17% < 30%).

Usage

import sys; sys.path.insert(0, 'code')
import kenchat
codec = kenchat.load_codec_vocab('kenga_full.pkl')
toks, src = kenchat.gen_tokens('fn add', 'mid_prophet_m53_w.txt',
                               max_tokens=200, codec=codec)
print(src)

data/ contains the exact template-disjoint splits (train/test JSONL) and the 806-mutant repair eval set used for every number above.

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